McDewey

Configure Cisco Expressway for Mobile and Remote Access For details on how to configure Cisco Expressway for Mobile and Remote Access, refer to the Mobile and Remote Access Through Cisco Expressway Deployment Guide. MRA Failover with Lightweight Keepalives This section is applicable from Release 14 onwards. Important The MRA High-Availability for endpoint registration allows Cisco Webex and Cisco Jabber to detect any failure of network elements like Cisco Expressway-E, Cisco Expressway-C, and Cisco Unified Communications Manager Administration in the Registration path and take corrective action to reregister to the Unified CM through the next available path. The endpoints send a lightweight STUN keepalive message to check connectivity in the registration path. When the Unified Communications Manager receives the lightweight STUN keepalive message, it validates the Cisco Expressway-C IP and responds to the message. The Unified CM discards the STUN keepalive message if it is received from any other IP. If a node in the registration path fails, endpoints will learn the failure through the lightweight STUN keepalive response that they receive and selects a different route path for future messages. This service helps the user to have smooth and continuous incoming and outgoing calls irrespective of outages or other maintenance modes. When Cisco Webex or Cisco Jabber registers to the Unified Communications Manager as a MRA device, the system displays the Expressway-C’s IP in the Unified CM (Device > Phone > IPv4 Address column). The Cisco IP Phones do not support registration failover. Note For more information, see Mobile and Remote Access Through Cisco Expressway Deployment Guide. Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs 78 Remote Worker Features Configure Cisco Expressway for Mobile and Remote Access